Influência da relação volumoso: concentrado e do tempo de retenção hidráulica sob a biodigestão anaeróbia de dejetos de bovinos
Carregando...
Data
2010-06-01
Autores
Orrico Júnior, Marco A. P. [UNESP]
Orrico, Ana C. A.
Lucas Júnior, Jorge de [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Associação Brasileira de Engenharia Agrícola (SBEA)
Resumo
O objetivo deste trabalho foi avaliar as possíveis alterações existentes na composição e no processo de biodigestão anaeróbia dos dejetos de bovinos em fase de terminação alimentados com diferentes proporções de volumoso: concentrado e com diferentes tempos de retenção hidráulica (TRH). Foram utilizados 24 biodigestores batelada de bancada com 12 litros de capacidade, dos quais 12 foram abastecidos com dejetos de bovinos alimentados com a dieta 1 (60% volumoso:40% concentrado) e dieta 2 (40% volumoso:60% concentrado) e submetidos a 30, 60, 90 e 120 dias de TRH. A eficiência do processo de biodigestão anaeróbia foi avaliada pelas reduções de sólidos totais, sólidos voláteis, fibra em detergente neutro, fibra em detergente ácido, celulose e número mais provável (NMP) de coliformes totais e termotolerantes, além dos potenciais de produção de biogás e metano. Os resultados mostraram que o aumento da proporção de volumoso na dieta levou a menor eficiência do processo, principalmente nos potenciais de produção de biogás e metano que foram em média 13% menor. Com relação ao NMP de coliformes totais e termotolerantes, foram observadas reduções significativas conforme aumentou TRH.
The aim of this survey was to evaluate the possible alterations that exist in composition and in anaerobic biodigestion process of cattle manure in phase of slaughter and fed with different proportions of roughage: concentrate and with different times of hydraulic retention (THR). 24 batch digesters of bench with capacity of 12 liters, from which 12 were provided with cattle manure that were fed with diet 1 (60% roughage: 40% concentrate) and diet 2 (40% roughage:60% concentrate) and submitted to 30; 60; 90 and 120 days of TRH were used. The efficiency of anaerobic biodigestion process was evaluated by reductions of total solids, volatile solids; neutral detergent fiber, acid detergent fiber, cellulose and the most probable number (MPN) of total and thermo tolerant coliforms, and production potential of biogas and methane were evaluated. Results showed that the increase of roughage proportion in diet conduced the smallest efficiency in the process, mainly in the production potential of biogas and methane, which were, in average, 13% smaller. Regarding to MPN of total and thermo tolerant coliforms, significative reductions as increased THR were observed.
The aim of this survey was to evaluate the possible alterations that exist in composition and in anaerobic biodigestion process of cattle manure in phase of slaughter and fed with different proportions of roughage: concentrate and with different times of hydraulic retention (THR). 24 batch digesters of bench with capacity of 12 liters, from which 12 were provided with cattle manure that were fed with diet 1 (60% roughage: 40% concentrate) and diet 2 (40% roughage:60% concentrate) and submitted to 30; 60; 90 and 120 days of TRH were used. The efficiency of anaerobic biodigestion process was evaluated by reductions of total solids, volatile solids; neutral detergent fiber, acid detergent fiber, cellulose and the most probable number (MPN) of total and thermo tolerant coliforms, and production potential of biogas and methane were evaluated. Results showed that the increase of roughage proportion in diet conduced the smallest efficiency in the process, mainly in the production potential of biogas and methane, which were, in average, 13% smaller. Regarding to MPN of total and thermo tolerant coliforms, significative reductions as increased THR were observed.
Descrição
Palavras-chave
diets, biodigestor, Energy, Methane, dietas, Biodigestor, Energia, Metano
Como citar
Engenharia Agrícola. Associação Brasileira de Engenharia Agrícola, v. 30, n. 3, p. 386-394, 2010.